/**
 * Copyright (C) 2011 Angelo Zerr <angelo.zerr@gmail.com> and Pascal Leclercq <pascal.leclercq@gmail.com>
 *
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.apache.struts2.views.xdocreport;

import java.util.HashMap;
import java.util.Map;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.util.ValueStack;

import fr.opensagres.xdocreport.core.XDocReportException;
import fr.opensagres.xdocreport.document.IXDocReport;
import fr.opensagres.xdocreport.template.IContext;

public class XDocReportResult extends AbstractXDocReportResult {

	private static final Map<Class, Boolean> isPopulateContextAwareClassCache = new HashMap<Class, Boolean>();
	
	@Override
	protected void populateContext(IXDocReport report, IContext context,
			String finalLocation, ActionInvocation invocation) throws Exception {
		ValueStack stack = invocation.getStack();
		Object action = stack.findValue(ACTION_KEY);
		if (action == null) {
			throw new XDocReportException(
					"Cannot retrieve action instance in value stack with key="
							+ ACTION_KEY);
		}
		PopulateContextAware populateContextAware = getPopulateContextAware(action);
		if (populateContextAware == null) {
			throw new XDocReportException("Action "
					+ action.getClass().getName() + " doesn't implement "
					+ PopulateContextAware.class.getName());
		}
		populateContextAware.populateContext(report, context);

	}

	protected PopulateContextAware getPopulateContextAware(Object action) {
		Boolean result = isPopulateContextAwareClassCache
				.get(action.getClass());
		if (result == null) {
			result = (action instanceof PopulateContextAware);
			isPopulateContextAwareClassCache.put(action.getClass(), result);
		}
		if (result) {
			return ((PopulateContextAware) action);
		}
		return null;
	}
}
